Fig. 3.

Channel selection and recommended set. a Group averaged classification accuracy as a function of number of channels when comparing a standard set of group optimally ranked and individually optimally ranked channels for both CPz-referenced and average-referenced EEG data. Accuracy is determined from fivefold CV. b Classification accuracy with additional channels at participant level using CPz-referenced data with the group-optimized ranking of electrodes. c Channels ranked by prediction accuracy for the group, the normalized ranking scale represents the group’s most important electrodes ranked from worst (0) to best (100). The labeled electrodes represent the 32 chosen electrodes for the pipeline, plus CPz as a reference (marked)